Improvement in hoisting-cranes



UNITED STATES PATENT EEICE.

CHARLES BASSE-Tfr, oE'MAss'rLLoN, oHro.

IMPROVEMENT IN HOISTING-CRANES.

Specification forming part of Letters Patent No. 36,598, dated October 7, 1862.

vertical section, and Fig. 8 is a cross-section.

Like letters refer to like parts in the several views.

The nature of my invention relates to aselfsupporting hoisting-crane in combination with a revolving arm and braces, and supporting the revolving arm and braces upon friction-balls placed in a circular track surrounding the mast.

A A in the several gures represent the bed-pieces or support for the mast. They consist of two pieces of timber framed together and crossing each other at right angles.

Brepresents the mast. This may be of any desirable height suited for the purpose for which it is intended. It is framed into the bed-pieces A A at theirintersection with each other. The mast B is kept in an upright p0- sition by braces C, which are framed into or otherwise fastened to the outer ends of the bed-pieces, the upper ends of the braces being framed into or otherwise secured to the mast at a point equal to about one-quarter of its height. Immediately above the braces is attached a circular plate or collar which surrounds the mast, as shown at D. This circular plate and collar D may be made of cast -iron or other suitable material. The disk or horizontal part has an annular ring or groove, E, Fig. 3, in which is placed' a sufficient number of round balls, E, of diameter greater than the depth of the groove E, to nearly fill the groove. The upper surface of the balls must rise above the upper surface of the disk D. Upon these balls I place another circular disk, F, Figs. l and 2. This is also annular and embraces both the mast and collar of the disk D.

G G represent braces that have their foot resting securely upon and fastened to the disk F. The upper ends of the braces G are secured by bolt or otherwise to the arm H at some point between its middle and vouter end. The arm H has its inner end pivoted to the top of the mast B by a strong bolt, as seen at I, so that it can swing entirely around in either direction. To the outer end ofthe arm H may be attached a pulley or sheeve for hoisting. Any weight that is attached thereto must of necessity rest principally upon the balls in the groove E. The arm H can there'- fore be swung around in either direction with great ease.

This hoistingcrane is portable, cheap, and easily constructed, and not liable to get out of repair, and is adapted t0 any purpose on land and water, for which such devices are intended.

What I claim as my'iniprovement, and desire to secure by Letters Patent, is-

The disk D and friction-balls E, in combination with the revolving arm H, when the several parts are constructed and arranged substantially as and for the purpose herein specified.

CHARLES BASSETT. Witnesses: W. H. BURRIDGE,

HENRY Vorn. 

